Can. 1246 §1. Sunday, on which by apostolic
tradition the paschal mystery is celebrated, must be observed in the universal
Church as the primordial holy day of obligation. The following days must also
be observed: the Nativity of our Lord Jesus Christ, the Epiphany, the
Ascension, the Body and Blood of Christ, Holy Mary the Mother of God, her
Immaculate Conception, her Assumption, Saint Joseph, Saint Peter and Saint Paul
the Apostles, and All Saints.

§2. With the prior approval of the Apostolic See,
however, the conference of bishops can suppress some of the holy days of
obligation or transfer them to a Sunday.

Can. 1247 On Sundays and other holy days of
obligation, the faithful are obliged to participate in the Mass.

Moreover, they are to abstain from those works and
aVairs which hinder the worship to be rendered to God, the joy proper to the
Lord’s day, or the suitable relaxation of mind and body.

Can. 1248 §1. A person who assists at a Mass celebrated
anywhere in a Catholic rite either on the feast day itself or in the evening of
the preceding day satisfies the obligation of participating in the Mass.

§2. If participation in the eucharistic celebration
becomes impossible because of the absence of a sacred minister or for another
grave cause, it is strongly recommended that the faithful take part in a
liturgy of the word if such a liturgy is celebrated in a parish church or other
sacred place according to the prescripts of the diocesan bishop or that they
devote themselves to prayer for a suitable time alone, as a family, or, as the
occasion permits, in groups of families.